Ab initio calculation of P,T-odd effects in low-lying excited states of ^207 PbO

Abstract
We report the results of an ab initio relativistic correlation calculation of the effective electric field on the electron in low-lying excited electronic states of PbO, required for the interpretation of an ongoing experiment at Yale University using this molecule in the search for the electric dipole moment of the electron. The generalized relativistic effective core potential and relativistic coupled cluster methods are used, followed by nonvariational one-center restoration of the four-component wavefunction in the core of the heavy atom. The values of the effective electric field acting on the electron are -3.2*10^24 Hz/(e*cm) for the a(1) state and -9.7*10^24 Hz/(e*cm) for the B(1) state. The hyperfine constant A_|| is calculated for the a(1) and B(1) states, and the former is compared with the known experimental value to provide a check on the accuracy of the method.

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